This will be my first gasser. I have been reading many other posts about gas conversions. The katana calls for a 50cc engine like the da50 and the bme50. I have seen many good results with conversions in this size. Some being the echo 44, I am told is the same as a bme44, also the stihl 56cc and 60cc. One post was showing a stihl 56cc right in the 3.5lb range with about 30lbs of thrust. I am trying to get some ones oppinion on which one would be a good first motor. I have trying to keep the price down. Any suggestions will be greatly appreciated.